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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c3a06cc2112953309857ebb49e66f13c7af24b2c61afeafdf49f36f69ae4312' 
  AND token = '0whCcX6YA2waQwnCMRzrj6wOpdTsF2300kdrq1/QZuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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