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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0c48aeedcbd5dc62abf1fb6a5e991cd7e41d61d7c47e98b9d8a6028188aa99' 
  AND token = 'hMMwec6jb69b1Bpn8jwS3e9k9rSDpsIpY/3P0PYPVN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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