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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5fcf3830ae1dff4de9bf94668998ba103b05fd84226ace04e24b0c0663f58b' 
  AND token = 'I0kc1rdYt8loPR/uwyjYc9XqZ89xjhgOjCf6zwZWLGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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