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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fc9160665d4acfa72c74a7efd6f1f4bc84174912d19a95b2d759f4d4db70ab' 
  AND token = '4W2DErBaUZnfH3zxcH4ZedxxhpPlYam7t0ry+dakwk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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