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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68de6340b7a2f556b162ccd13d885d83af944271bc8d536b5b96001c96f40fdd' 
  AND token = 'APKHXvXu4+T4MZ7EdUm+HwCFZ4HQdy67ZD080nziZsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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