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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd403db9571d9c92dc1d12df567a56cd24eff11cf5234ea586d49dc58ade05c88' 
  AND token = '4wpSaFtuhfsW8xmsuQhwVFF3STIKu7PThyK93U+Z5aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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