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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e76e91d32ccddd7b29733424b802105ab2a964f747d14d9f2c87ab900d3484' 
  AND token = '2UjanO9C4H0LNppwEPeS06803ffe1ebO+dX4yITD2eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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