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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c035e4cc3ef70f881badbf87ad362c0201302132051b245652570bc71804058' 
  AND token = 'jWImGT0P0M41U7ErF2qY7jPjXb3zZyztc7UxPcCYjaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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