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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e738a55eb893b2afadde97329fa54165fe11c78b6b3cf482cd216c660be91b0' 
  AND token = 'SogXn8YmaAolPvU4+EyfT08yEzOUZ3RXPEeppFSIlro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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