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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae9dd21c117afd6c358812818e24764d9766ed7fe6d8e6c5d71756f9114eb0b' 
  AND token = 'EtBpTFRH6qkfYY1HIWOM6dVdfBPGhn8ydG3LgYWo1e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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