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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738b269e126908330669d1d5cc91f8316a08d5db3d3f96eae3ba0371bd100e9e' 
  AND token = 'c5cMubSbJWqobA4FEWNG1IeubluTYB/MmgjW9qlvmLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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