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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084bda8babce10c6d040dfb3e2e70fbf5a9df2c89dbd54ccd3b2e4eb1067e565' 
  AND token = 'sZ5G53OPQ8F49alPGpaU3gOwbDPXBeO416nXti2GYR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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