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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147d46279928678dae1fc6dfaa703d88a02a642497e8a46e58329fa87247b9d3' 
  AND token = 'J//aHhUtRqvbb/g/80j22/cJ2cLwsRov/+sXCeADqg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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