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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6cd43b63303641ac55c4f0d2e08498289d10df4ad55a7fcb072618336a20871' 
  AND token = '7J4wsW/DBc/ze7qmdRorWQRMusKKf/qCn59xV8XzdDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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