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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49fa4efbee36b7761256307cec8be237c9a056aa258a20f40b8ca427caee8513' 
  AND token = 'i7vUt8aF5FhkOt0ih1mR/WETtGB0HFSQ7e9sMBHm6io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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