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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8b06641c7dd975e86b0a9db68427e83f008486112c99ada08f5c2b6abd901e' 
  AND token = 'FVLj79uNG7uSp6IcOelVRFUOejz8EX+4eg0benMsjN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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