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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5ec8e9373342f9e40d4d9d14e902191afd37d17eb4bea218407b44069efd25' 
  AND token = 'J2nWMZprqQTatTGqsRKjz6MORqQuWBO1kwD6JUSTC2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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