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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6479a30a6bc387a474543a07ded53c87ec5307b30de8511e21cd581346ebe89' 
  AND token = 'RrlT6aw8vdy4L/94p7SP/pXXG2qwZIK9K4+oHU0RjqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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