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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308c8dd9e7a1d6aec2e7f6270f51b5d5a4305cae26c79410c8cbae1530720081' 
  AND token = 'YnG+nbWBLhgFr1yJleykurnowWvf/63JGJqTlPE9e1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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