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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c292c3b26231f1a4bd6af67f8c5a7fbf0700e8c5654f0cfb6c8e922ee0816e7e' 
  AND token = 'cFZlkq7y753jss+BN7YAuTdVJ1a5w/xMI9onYbQlbHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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