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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cfe68f12229f3b299f740a35a05ad581159186cf47482ee943d1a55e51e57c5' 
  AND token = 'xkKjJJndGvs7AwNvCnnJsCfFi8Woq81ZwP8/716pLOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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