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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b54d428bdf766df7f0a35637e1421b51415886244fccbf0e208823577bd70f2' 
  AND token = 'a7aILNC2pDimcIsvSR5sSJOrU+yr5YEjKZvh3ri4oVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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