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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed4387c2fd0b4be3cd330081ab47a8beca5f4e8a88413c52fa09d0beed9684d' 
  AND token = 'ncZ4TrVFwfLOEGdOIKd9VtI/KzBu7rJNLAa+EcOgEjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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