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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd36d1dd8c8647912921f6518c894150f6a9d50a05fd0b650754ce5fe35c6a5a' 
  AND token = '73ViN2OZ/vfiV/AVg9OTsUS6o3YW6VM+9N8Yp1bb/Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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