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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889a025c70a3094f6c602fbd339ddbe2d314c493c3759ab9fe649d7fa59cc1c5' 
  AND token = 'FEMXCEK9syAVV5iQ9/xPKuOCrNX7GLajeqNS7g5guBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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