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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cab530b4aa9ba08aa1445d5c9cdc38f86c4881ed401814553c04f71c2d9964d' 
  AND token = 'NsXRj2LYVrVIEwsPHeJsSDd7G5hZg7oJc3tXC69pHL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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