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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd3221041f2aa3f0b87cad202de6d7a1d092724ef551ba459c4fb2d6adb82e0' 
  AND token = '5B50gcsFz2g90dCchgjostDbkXVMUSgfOluoZirF/B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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