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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817de66ba27b323e5e8dbe25a937b287ad5850531bf7c0f3b82cb0ef23dc37ee' 
  AND token = '485y9GOg6aNWqCrLBvcGYJ/n33cWddDQ+X5wkjh+4iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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