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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd15b2ac6ba1b68a400fe3d545390ed5e283e84bf10db5fe465946b2e8d0b42' 
  AND token = 'XMveB8g+De5+CEXCjx5TCrS343zpiVhLo+edBdCwCrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}