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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1b0172c4a8e51294832e90a0dfad575073c699fe285d205f187e50768961b3' 
  AND token = 'sil0Vj7JZqm7Uls6pjl84TO2fcPCkEy6icFPIO1szLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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