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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5926844cde10301067367d85af976c283332cab3c949ea194a4bf1fb84a03d43' 
  AND token = '4A8Zuy32mSTZ/kDb/v0mNxtQZBr8zvLp0AZ8oT879nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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