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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7cbbe21eb57173ebad0e2ef80edf761f3582128c823ad122536b42a49df2bd' 
  AND token = 'zvFdSilAkKwyIUy0lgChFP+0qtMNsx/hvdO+aGvJe+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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