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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea1e028429f48e562e63e28ba874cecd6442be88990372c7cfa8562cb1070694' 
  AND token = 'flinRMAADyiI2HPFh7xAo1jPgqCoJPuyZCVPdARSQhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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