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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d237e63b2f337b19b0dd2c7f38404d418e07877543695cd30a8dd5abc876d9' 
  AND token = 'XUCPIBBeJOKV2ILROe8nhnn9Tu3gfaCDwUCi02QcVdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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