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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c8673be3c8adcce91b2f5ddf751b7fbd2b218d4a1bc8d10a78f813ab216796' 
  AND token = '4P6xeCAD9Py1arb1x36NGuCoMSbz4F/LAbrqDwXRlvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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