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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0e95739134f7670b2f5bf83f6d4f6a416866ccbeac6ee7e558ef032c33d403' 
  AND token = 'YDZZklBENuQgUT0Xv8zd8ZpzK+dfVv80Oxu2oQ29xdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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