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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1664b14c9633e982bfe62461d39d6ae2c1a7126ed14b2ceae80fe648b4dcb571' 
  AND token = 'a8uinZ6zJMrLuRFdGganKV5AF63+p7jXEmMmkSYeINA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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