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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57fc969886e8f04b47891f668b3431158f7b744cbe7604ca1eb2da6455bd610' 
  AND token = 'ssSNb7ht6mxJBQIA2eGFPc/JjyXnXJfQPg7SP6kWLK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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