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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db96d7f9325d8f41ab20ffd92b7d884302569e54f673814002aa842eca1e76e' 
  AND token = 'v/E2aRqQhHeoujiC54oNFmvgYT3Yf8mjBvACjR9o5Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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