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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4608e581e587f71e43e56260cfcfbd37d767e15d30b9d7ab0735fafa87c3de' 
  AND token = '6e+Wc58N0SVB90SAG3+8BqLJ3josO3DSyfKZgI6QE+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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