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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab03935aeb5a82aa414f77548b2aa1c10c845b35ac988a5523244736bd72f06' 
  AND token = 'oYgndip6OpM4IbtvcIfcto5uYkb6kEujC6XSgfPTqmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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