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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5040c3e058aa47e174914aea93cbf41c56f0c72dbb16e53f09c49a083de6b465' 
  AND token = 'IAa5YwzAQFECG5OqMwR7TrygbR/DqUB8f6XlnFKRgFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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