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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe41393b885d24db5f79ae942ba6b3e46752ae181b1a75b59df09503e5efacf' 
  AND token = 'zxe6odWA0OdnnSWd+QAYGRozn+RM9N5zWGYxscgLZd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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