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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2dca0d33a27268ef9418f67fab89c5b8c0dfecf1d573c9f37aa540e3ddeac6' 
  AND token = 'ZPngrSHx47CpISmsLiWU4pIrNEJiFdyixMFpKmF1SY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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