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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7442ea79d8018e23bb1298c76a1304a846fc9a2e1eec58358a64b11ac3d0d0c' 
  AND token = '9iA4FWZmgnwoWH8UFoSCu08JDdfDSFiKfR0rjD1Rx5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01053

JSON explain

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