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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f103d902e0a7759a11e30d7a4bf539df1c7ab523aaf2787af0ae47f484d7af29' 
  AND token = '0aD3jf3HVj1DVK+grcoWH9OrmjcK4itDR7MDnnt61oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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