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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1ca0ebd9754c54f9d9c5ac6f925884a71742b8f20bf9c6ed20e1345a966658' 
  AND token = 'cqh75o7/AGPlsIbMxlD24ovgCufSa7yNmf2iUUjIr+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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