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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '521855237538370527c47309fc46df8e7a79203d573fb372d87df11ed4ee5b16' 
  AND token = '2TVZQIYT2VGdsil6MAfk+Ms8Nc8HbdxEEVEbtvxFOZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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