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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6920070e619c7e06c03d88b79e33b4b390bd2520b625001f0afba0c5833d4c' 
  AND token = 'GptisxBHE7D56dZ6JwEvR2oR0sag6wuNaV+WgJYWNuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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