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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2961aff82d951f361d71e873f5f3ffeef87d5a6a632bb3e9335bbd37cd995e9b' 
  AND token = 'yfOHSpF7DdOYGsiSyi+sogV4yO8j4Vrp0GA+zSWkLJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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