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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb10f412d1a85afca220c25bd48794ea220c0d9b7cdfd2afe6c386c9f50a30e3' 
  AND token = '94wn/cxOZvNy0siqnWunDk0kBeOEnvrBGo7U3RcEQQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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