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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca94e67d761e8ef2fdfac62db7e17d196bbc2d0502ea11766bd2ddede18114bd' 
  AND token = '0qM0pqoje++BzW3qWS36ksNF4Fh5lRUEEBCC1iopBQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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