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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c934ce758d8299fea65c57a65dca8b7dd25ee07dc6b76c726ce5d3b26b0426f6' 
  AND token = 'Wgbc0tdlflO5UU5jYC26QBdBdbBIDr+j8VpWSIQN1A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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