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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356083503e020afe348853b5f0f7dd44cd865c98e8c2cb04063d26b6dd8edc5b' 
  AND token = 'kf8iNyz8Bk6tGZNDWyiiwWliOOz/59bt1GXm6oiggng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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