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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010bdc28416e8fd8d732630feae9f59919aacb19951df13c4bbf20c856142245' 
  AND token = 'fIQ9IBzRTSE5/gXWsKgsm6yjaUnRpQ4Ips/uwgnnPEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00138

JSON explain

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