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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a002bfed3e4b07f3fc3cbf61a16e7fcdc88576e0f1a9bbaf703711b3e8445fe' 
  AND token = 'nyaO1p1ayBD11d+FolgZJlUvM8o+TgM2U9j+bLz9mG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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