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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd40c6d0fe09d0ded932daa74d8b5650e2549ae608a1970abbdf419bae62db91' 
  AND token = 'SDd6mLmnbzn2yk7YIhii13EE3EYwwMmJZRXb1lSOSLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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