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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7562be687c8e6af338668ec256d0a56b8fce86ca415f64ee639e7bf8845db486' 
  AND token = '3Q5p5VhtrP5rrf2GHpkPgkhXywXMhzJSZCaWfAUIuSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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